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Re: [Xen-devel] [PATCH] x86/32on64: zero-extend hypercall index before u
| To: | Jan Beulich <JBeulich@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] x86/32on64: zero-extend hypercall index before use in memory access (debug mode only) |
| From: | Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
| Date: | Wed, 15 Dec 2010 14:21:11 -0800 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Wed, 15 Dec 2010 14:33:31 -0800 |
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On 12/15/2010 02:50 AM, Jan Beulich wrote:
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
>
> --- a/xen/arch/x86/x86_64/compat/entry.S
> +++ b/xen/arch/x86/x86_64/compat/entry.S
> @@ -25,7 +25,8 @@ ENTRY(compat_hypercall)
> pushq UREGS_rbx(%rsp); pushq %rcx; pushq %rdx; pushq %rsi; pushq %rdi
> pushq UREGS_rbp+5*8(%rsp)
> leaq compat_hypercall_args_table(%rip),%r10
> - movq $6,%rcx
> + movl %eax,%eax
> + movl $6,%ecx
Is the second line part of the fix, or just a drive-by tweak?
J
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